ZHCSGZ6A October 2017 – February 2025 TPS6508700
PRODUCTION DATA
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The PMIC synchronous step-down DC-DC converters include a unique, hysteretic PWM-controller scheme which enables a high switching-frequency converter, excellent transient and AC load regulation as well as operation with cost-competitive external components. The controller topology supports forced PWM mode as well as power-save mode operation. Power-save mode operation, or PFM mode, reduces the quiescent current consumption and ensures high conversion efficiency at light loads by skipping switch pulses. In forced PWM mode, the device operates on a quasi-fixed frequency, avoids pulse skipping, and allows filtering of the switch noise by external filter components. The PMIC device offers fixed output voltage options featuring a small solution size by using only three external components per converter.
A significant advantage of a PMIC over other hysteretic PWM controller topologies is the excellent AC load transient regulation capability of PMICs. When the output voltage falls below the threshold of the error comparator, a switch pulse is initiated, and the high-side switch is turned on. The switch remains turned on until a minimum on-time (tONmin) expires and the output voltage trips the threshold of the error comparator, or until the inductor current reaches the current limit of the high-side switch. When the high-side switch turns off, the low-side switch rectifier is turned on and the inductor current ramps down until the high-side switch turns on again or the inductor current reaches zero. In forced PWM mode operation, negative inductor current is allowed to enable continuous conduction mode even at no load condition.
Figure 6-3 Converter Block Diagram